My understanding of bobbin work is that you can sew with threads too thick to put thru the eye of the needle by putting them in the bobbin and sewing with the piece face down. I used to do some of it with my old New Home with the drop in bobbin. I"m not sure how well it would work on my machines now as they don't have the drop in bobbin and don't look like the bobbin casings would accept a very thick thread.